update ssa.Slice

internal/runtime/z_slice.go

@@ -18,6 +18,8 @@ package runtime
 
 import (
 	"unsafe"
+
+	"github.com/goplus/llgo/internal/runtime/c"
 )
 
 // -----------------------------------------------------------------------------
@@ -54,4 +56,18 @@ func SliceData(s Slice) unsafe.Pointer {
 	return s.data
 }
 
+func NewSlice3(base unsafe.Pointer, eltSize, cap, i, j, k int) (s Slice) {
+	if i < 0 || j < i || k < j || k > cap {
+		panic("slice index out of bounds")
+	}
+	s.len = j - i
+	s.cap = k - i
+	if k-i > 0 {
+		s.data = c.Advance(base, i*eltSize)
+	} else {
+		s.data = base
+	}
+	return
+}
+
 // -----------------------------------------------------------------------------